Hello,
Recently we ran into a issue where we installed a font for testing, and LightBurn would only recognize it as the default Arial style. The font itself worked fine in all my other programs, so I decided to dig a little deeper and see if I could determine the issue.
I downloaded FontForge and opened the file in question, tried to export it to other formats to no avail.
Long story short, I figured out that some of the font info, namely the Fontname, Family Name, and TTF Fullname all had a space at the end of the name scheme. These can be changed and modified with the FontForge Font Info tool.
After making the changes, everything worked correctly. Not sure if it was an issue with LightBurn directly or the Qt platform itself.
This was on a Windows 10 machine BTW.